Transmission electron microscopy study of graphite under in situ ion irradiation

J. A. Hinks, A. N. Jones, A. Theodosiou, J. A. Van Den Berg, S. E. Donnelly

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

Graphite is employed as a moderator and structural component in 18 of the UK's fleet of Magnox and Advanced Gas-cooled Reactors (AGRs). During the operational lifetime of a reactor, graphite undergoes complex physical and mechanical property changes including dimensional modification, owing to the effects of temperature, oxidation and irradiation-induced atomic displacements. In order to safely extend the lifetime of the current fleet of AGRs, and also to develop materials for GenIV concepts such as the Very-High-Temperature Reactor (VHTR), it is important to gain a better understanding of the fundamental atomic processes which underpin the behaviour of graphite under current and future operational conditions. This study has focused on the effects of temperature and displacing radiation on the evolution of Mrozowski cracks in highly-orientated pyrolytic graphite (HOPG) using the new Microscope and Ion Accelerator for Materials Investigations (MIAMI) facility. This instrument allows transmission electron microscopy to be performed in situ whilst simultaneously ion irradiating to radiation damage levels typically reached in a reactor. By using this technique, it is possible to explore the development of radiation damage under a range of different conditions continuously from start-to-finish rather than just observing the end-states accessible in ex situ studies.

LanguageEnglish
Article number012046
JournalJournal of Physics: Conference Series
Volume371
Early online date2 Jul 2012
DOIs
Publication statusPublished - Sep 2012
EventElectron Microscopy and Analysis Group Conference - Birmingham, United Kingdom
Duration: 6 Sep 20119 Sep 2011

Fingerprint

ion irradiation
gas cooled reactors
graphite
reactors
radiation damage
transmission electron microscopy
ion accelerators
life (durability)
moderators
pyrolytic graphite
accelerators
cracks
physical properties
microscopes
mechanical properties
oxidation
irradiation
temperature
radiation
ions

Cite this

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title = "Transmission electron microscopy study of graphite under in situ ion irradiation",
abstract = "Graphite is employed as a moderator and structural component in 18 of the UK's fleet of Magnox and Advanced Gas-cooled Reactors (AGRs). During the operational lifetime of a reactor, graphite undergoes complex physical and mechanical property changes including dimensional modification, owing to the effects of temperature, oxidation and irradiation-induced atomic displacements. In order to safely extend the lifetime of the current fleet of AGRs, and also to develop materials for GenIV concepts such as the Very-High-Temperature Reactor (VHTR), it is important to gain a better understanding of the fundamental atomic processes which underpin the behaviour of graphite under current and future operational conditions. This study has focused on the effects of temperature and displacing radiation on the evolution of Mrozowski cracks in highly-orientated pyrolytic graphite (HOPG) using the new Microscope and Ion Accelerator for Materials Investigations (MIAMI) facility. This instrument allows transmission electron microscopy to be performed in situ whilst simultaneously ion irradiating to radiation damage levels typically reached in a reactor. By using this technique, it is possible to explore the development of radiation damage under a range of different conditions continuously from start-to-finish rather than just observing the end-states accessible in ex situ studies.",
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Transmission electron microscopy study of graphite under in situ ion irradiation. / Hinks, J. A.; Jones, A. N.; Theodosiou, A.; Van Den Berg, J. A.; Donnelly, S. E.

In: Journal of Physics: Conference Series, Vol. 371, 012046, 09.2012.

Research output: Contribution to journalConference article

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AU - Jones, A. N.

AU - Theodosiou, A.

AU - Van Den Berg, J. A.

AU - Donnelly, S. E.

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AB - Graphite is employed as a moderator and structural component in 18 of the UK's fleet of Magnox and Advanced Gas-cooled Reactors (AGRs). During the operational lifetime of a reactor, graphite undergoes complex physical and mechanical property changes including dimensional modification, owing to the effects of temperature, oxidation and irradiation-induced atomic displacements. In order to safely extend the lifetime of the current fleet of AGRs, and also to develop materials for GenIV concepts such as the Very-High-Temperature Reactor (VHTR), it is important to gain a better understanding of the fundamental atomic processes which underpin the behaviour of graphite under current and future operational conditions. This study has focused on the effects of temperature and displacing radiation on the evolution of Mrozowski cracks in highly-orientated pyrolytic graphite (HOPG) using the new Microscope and Ion Accelerator for Materials Investigations (MIAMI) facility. This instrument allows transmission electron microscopy to be performed in situ whilst simultaneously ion irradiating to radiation damage levels typically reached in a reactor. By using this technique, it is possible to explore the development of radiation damage under a range of different conditions continuously from start-to-finish rather than just observing the end-states accessible in ex situ studies.

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